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. 2021 Jan 14;8:620257. doi: 10.3389/fbioe.2020.620257

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Copyright © 2021 Li, Wang, Zhou, Liang and Luan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Comparison of original data and features: (A) original data, (B) SIFT feature, (C) GLCM feature, (D) GLH feature, and (E) features by AlexNet pre-trained model extracted from convolutional layers 1–5.